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478f8287c0
It's like `Symbol` but for byte strings. The interner is now used for both `Symbol` and `ByteSymbol`. E.g. if you intern `"dog"` and `b"dog"` you'll get a `Symbol` and a `ByteSymbol` with the same index and the characters will only be stored once. The motivation for this is to eliminate the `Arc`s in `ast::LitKind`, to make `ast::LitKind` impl `Copy`, and to avoid the need to arena-allocate `ast::LitKind` in HIR. The latter change reduces peak memory by a non-trivial amount on literal-heavy benchmarks such as `deep-vector` and `tuple-stress`. `Encoder`, `Decoder`, `SpanEncoder`, and `SpanDecoder` all get some changes so that they can handle normal strings and byte strings. This change does slow down compilation of programs that use `include_bytes!` on large files, because the contents of those files are now interned (hashed). This makes `include_bytes!` more similar to `include_str!`, though `include_bytes!` contents still aren't escaped, and hashing is still much cheaper than escaping.
15 lines
522 B
Rust
15 lines
522 B
Rust
/// This higher-order macro declares a list of types which can be allocated by `Arena`.
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/// Note that all `Copy` types can be allocated by default and need not be specified here.
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#[macro_export]
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macro_rules! arena_types {
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($macro:path) => (
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$macro!([
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// HIR types
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[] asm_template: rustc_ast::InlineAsmTemplatePiece,
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[] attribute: rustc_hir::Attribute,
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[] owner_info: rustc_hir::OwnerInfo<'tcx>,
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[] macro_def: rustc_ast::MacroDef,
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]);
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)
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}
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